RV plumbing and house plumbing aren't that different. If you have a sink, shower and toilet you probably have 3 cold water lines, 2 hot water lines and 2 drain lines. I just remodeled my entire 2010 trailer with new flooring, new fabric on the sofa and dinette cushions, painted the cabinets, new counter tops, new blinds and new faucets. Total cost was under $3K. Google and YouTube are your newest best friends on this project. It is not that difficult and the results are amazing! Good luck and have fun.
2017 Ram 1500 Tradesman EcoDiesel
2010 Dutchmen 24 FB-SL
Curt 10,000# WDH
Never underestimate the stupidity of people in large groups.